Florida 26: Rep. David Rivera (R) vs. Joe Garcia (D)

The race in Florida's southernmost congressional district was a rematch of 2010, but the dynamics could not have been more different. Republican incumbent David Rivera was elected in the Republican wave two years ago. Democrat Joe Garcia, a former Miami-Dade County Democratic Party chairman, lost by 9 points. The key difference this time was that Rivera was dogged by scandal and ethics issues -- and this time, he lost. Garcia is the projected winner.

Georgia 12: Rep. John Barrow (D) vs. Lee Anderson (R)

Moderate Georgia Democratic Rep. John Barrow was re-elected to a fifth term in the House on Tuesday, CNN projects, and is the last white male Democrat from the Deep South in the House of Representatives. The remaining Democratic congressmen from Louisiana, Mississippi, Alabama, South Carolina and Georgia are all African-Americans.

The member of the "Blue Dog" Democrats, the group of fiscal conservatives in the House, has faced strong Republican challenges every cycle, and this year Republican Lee Anderson got 46% to Barrow's 54%. Both parties put considerable resources into the race in the heavily Republican district.

Though Barrow survived this year, the ranks of moderate Democrats have dwindled in the House, and fellow blue dog Larry Kissell lost his race in North Carolina.

Illinois 2: Rep. Jesse Jackson Jr. (D) vs. Brian Woodworth (R)

Despite a lengthy absence from Capitol Hill due to illness, Democratic Rep. Jesse Jackson Jr. will easily hold on to his Illinois seat, CNN projects.

Jackson was projected to defeated GOP contender Brian Woodworth, an attorney and university professor. Woodworth had criticized Jackson during the campaign for leaving the district unrepresented.

The nine-term congressman has been away from Congress and largely out of the public eye since May. His office said in June that he was taking a leave of absence, and the Mayo Clinic disclosed in August that he was suffering from depression.

The FBI and federal prosecutors in Washington are investigating Jackson for possible financial improprieties, according to a law enforcement official.

The House Ethics Committee is looking into allegations that, in 2008, Jackson or one of his associates offered to raise money for then-Illinois Gov. Rod Blagojevich in exchange for Jackson being appointed to the Senate seat vacated by Barack Obama.

Illinois 8: Rep. Joe Walsh (R) vs. Tammy Duckworth (D)

Freshman Republican Joe Walsh's loss Tuesday was no surprise, since he had been high on the list of endangered GOP incumbents. Walsh barely won his seat in 2010 and redistricting had made the district more Democratic. He had the additional misfortune of running in a presidential election year when favorite son Barack Obama was heading the ticket for the other party. Walsh made headlines with a number of controversial statements, including his assertion that medical science has advanced to the point where abortions are never necessary to save a woman's life. Democrat Tammy Duckworth, a decorated Iraq war veteran who lost her legs in combat, led in fund-raising.

Illinois 10: Rep. Robert Dold (R) vs. Brad Schneider (D)

Republican Robert Dold had won this Democratic-friendly district in the Republican wave of 2010, replacing fellow Republican Mark Kirk, who ran for the U.S. Senate. But the redrawn district was even more Democratic-friendly and Dold lost Tuesday to businessman Brad Schneider.

Iowa 3: Rep. Tom Latham (R) vs. Rep. Leonard Boswell (D)

Merged district

Iowa was one of 10 states to lose seats in Congress because of redistricting, setting up a member-on-member showdown between two veteran lawmakers in a merged Des Moines-area district. Democrat Leonard Boswell represented much of this new district in the late 1990s. But Republican Tom Latham won with a fund-raising advantage due in part to his friendship with Boehner.

Iowa 4: Rep. Steve King (R) vs. Christie Vilsack (D)

Republican incumbent Steve King's bid for a sixth term in Congress succeeded, in a new district against a tough new challenger, Democrat Christie Vilsack, Iowa's former first lady and the wife of U.S. Agriculture Secretary Tom Vilsack. King had a fund-raising advantage over Vilsack, and most of the counties in the enormous new district had gone for John McCain in 2008.

Louisiana 3: Rep. Charles Boustany (R) vs. Rep. Jeff Landry (R)

Merged district

As in California, redistricting and a "top-two" primary system forced two incumbent lawmakers of the same party into a November showdown. Republican Charles Boustany, a surgeon elected in 2004, faced freshman Republican Jeff Landry, an attorney and businessman, former police officer and tea party favorite. Boustany represented more of the new district than did Landry, but the freshman proved he was capable of pulling off surprises when he defeated the better-known former Louisiana House speaker in the 2010 primary. Under state law, the November election serves as an open primary, in which the top two finishers will advance to a December runoff if no one gets a majority. A winner has not been yet projected.

Maryland 6: Rep. Roscoe Bartlett (R) vs. John Delaney (D)