Meanwhile, appointed Sen. Tim Scott is on the ballot, too, and he's going to cruise through his first statewide primary with ease. He technically has a primary challenger, but there's nothing to the challenge. Not only do 65 percent of South Carolina Republicans give Scott an "excellent" or "good" rating, according to that Palmetto poll, but, as the Charleston Post and Courier wrote in May, "Repeated efforts by state media to locate [Scott's opponent] have been unsuccessful."
MAINE'S 2ND CONGRESSIONAL DISTRICT
When Democratic Rep. Michael Michaud announced last year that he would run for governor, that left his district — a vast stretch of northern Maine that is the largest congressional district east of the Mississippi River — open for new representation. Two Democrats from the state Senate, Emily Cain and Troy Jackson, leaped at the opportunity. Jackson is well-connected with local labor, never a liability in a Democratic primary, but Cain has cast Jackson's voting record as insufficiently progressive on several major issues: abortion, same-sex marriage, and the environment. EMILY's List, the Democratic women's group, and the League of Conservation Voters have spent over $200,000 between them boosting Cain. Whoever wins on Tuesday will be a favorite, but definitely not a lock, to represent the district in 2015. Republicans Bruce Poliquin (who previously lost two statewide GOP primaries) and Kevin Raye (who previously lost two races against Michaud) are competing for their party's nomination.
VIRGINIA'S 7TH CONGRESSIONAL DISTRICT
No one expects House Majority Leader Eric Cantor to lose his primary Tuesday, and he'll probably win comfortably. But the aggressive campaign Cantor had to run against local economics professor Dave Brat symbolizes how, even if not very many incumbents are losing primaries, those nominating contests have still gotten much less stable than in the past. Cantor aired negative TV ads against Brat, sent mailers boasting about defeating a pro-"amnesty" immigration-reform plan, and spent more money than usual on campaign activities (as opposed to fundraising for the rest of his party), all unusually forceful moves for a party leader up for renomination.
VIRGINIA'S 8TH CONGRESSIONAL DISTRICT
Democratic Rep. Jim Moran is retiring, giving his party the opportunity to anoint the next member of Congress from his safely Democratic section of Northern Virginia. Former Lt. Gov. Don Beyer appears to be the front-runner in a crowded field of seven Democratic primary hopefuls, thanks not only to his prior political experience but also because of the name recognition and wealth that come with owning a successful local car dealership and serving as the national finance chair for a presidential candidate (Howard Dean in 2004). There has been a little outside money spent on behalf of state Del. Patrick Hope, but Beyer's million-dollar campaign has outstripped the rest of the divided field. Moran hasn't endorsed anyone, telling The Washington Post that "it wouldn't be fair."