Clark had the backing of Clinton and EMILY's List in her second bid for Congress earlier this summer. She and former Rep. Rick Nolan vied for the Democratic nomination to challenge Rep. Chip Cravaack (R) in a fall tossup race.
As much as the Clinton endorsement counted here, Nolan was able to rally the state's Democratic establishment behind his campaign.
Connecticut's 5th: Aug. 14 Loss Endorsed Candidate: Dan Roberti Ties to Clinton: Worked with Clinton ally Carville; father is a Clinton donor
A political newcomer, Roberti finished a distant third in the Democratic primary, following Clinton's eleventh-hour endorsement. But the lateness of the support makes it hard to pin Roberti's third-place finish to Clinton.
Carville backed Roberti early on and did much to help him on the fundraising front, which helped give the campaign legitimacy.
New York's 18th: June 26 Win Endorsed Candidate: Attorney Sean Patrick Maloney Ties to Clinton: Former White House staffer
Maloney was in a competitive Democratic primary to take on Rep. Nan Hayworth in the fall. Clinton, per usual form, endorsed his former staffer and performed robocalls.
At a time when the Wall Street Journal was calling into question Maloney's resume, the Clinton endorsement offered the candidate political cover.
New Mexico's 1st: June 5 Loss Endorsed Candidate: Marty Chávez Ties to Clinton: Endorsed Clinton during the 2008 Democratic presidential primary
In New Mexico's open 1st district race, Clinton endorsed former Albuquerque Mayor, Chávez, who was involved in a competitive three-way Democratic primary. The endorsement came about four months before the June 5 primary, and then he did a robocall for Chávez with about three weeks to go. But the endorsement was not enough to help Chávez, and he finished well behind Bernalillo County Commissioner Michelle Lujan Grisham (who won) and state Sen. Eric Griego.
Chávez began the race as the favorite and with the highest name recognition. But he didn't spend big on TV until the week before the primary.
New Jersey's 9th: June 5 Win Endorsed Candidate: Rep. Bill Pascrell Ties to Clinton: Endorsed Clinton during the 2008 Democratic presidential primary
The odds were against Pascrell when it became clear that he and Rep. Steven Rothman were going to run against each other in the 9th district Democratic primary.
Rothman was an early Obama 2008 backer, while Pascrell was a Hillary man. Clinton's endorsement of Pascrell seemed to blindside Rothman.
Up until just days before Clinton endorsed, Rothman insisted his loyal defense of Clinton during impeachment was enough to keep Clinton's Pascrell endorsement at bay.
He was dead wrong. Clinton did not merely endorse, but he also made a personal appearance in the district.
Texas' 16th: May 30 Loss Endorsed Candidate: Rep. Silvestre Reyes Ties to Clinton: Endorsed Clinton during the 2008 Democratic presidential primary
A double-shot endorsement from both Clinton and Obama could not save Reyes from his primary challenger, former El Paso City Councilman Beto O'Rourke.
Clinton personally went to the El Paso district to campaign on behalf of Reyes and the incumbent still came up short.
Pennsylvania's 12th: April 24 Win Endorsed Candidate: Rep. Mark Critz Ties to Clinton: Critz's predecessor and former boss, the late Rep. John Murtha (D-Pa.), was a Clinton supporter in 2008.
Former Sen. Scott Brown, R-Mass., candidate for U.S. Senate in New Hampshire, holds his hand over his heart during the singing of the national anthem as he waits to take the stage for his town hall campaign rally with Sen. John McCain at the Pinkerton Academy in Derry, N.H., on Monday, Aug. 18, 2014.