4) Frontrunning independent Angus King is about to face his first hit from an outside group advertising on air in the Maine Senate race. The Chamber of Commerce, which is backing Republican nominee Charlie Summers, is going up on TV against the former governor. The group's decision to air the ad reaffirms King's frontrunner status in the race (you won't see any GOP groups picking on Democrat Cynthia Dill). The Portland Press Herald: 3) Former Rep. Pete Hoekstra released an ad hitting Clark Durant, his primary opponent in the Senate race. It's a pivot for frontrunner Hoesktra, who previously stayed focused on drawing a contrast with Democratic Sen. Debbie Stabenow. But Durant and a super PAC supporting him have been going after Hoekstra aggressively ahead of the August 7 primary, and he responded Monday. "Lagging in the polls, Clark Durant has started running dishonest attack ads," intones the ad's narrator. "Don't let Durant get away with it." The ad then notes various politicians who've praised Hoesktra. Meanwhile, the Detroit News endorsed Hoekstra in the primary. In other Michigan Senate news, the state Democratic Party is filing an IRS complaint on the salary Durant received from a nonprofit. 2) Hawaii Democratic Rep. Mazie Hirono is up with a new positive spot on education which reminds voters she helped President Obama pass the "America Competes Act." With about two weeks left until the Democratic Senate primary, Hirono is not sitting on her hands against former Rep. Ed Case. Meanwhile, a newly released DSCC/Mellman Group poll conducted for the committee from July 18-22 that shows Hirono leading presumptive GOP nominee Linda Lingle 52 percent to 33 percent. A Honolulu Star Advertiser poll also out this morning conducted by Ward research shows Hirono leading Case 55 percent to 37 percent in the Democratic primary. In general election matchups, Hirono leads Lingle 58 percent to 39 percent and Case leads Lingle 56 percent to 38 percent. It's worth noting that the poll was conducted from July 12-21, a long time for a survey to be in the field. Hirono and Case are scheduled to debate this evening. 1) The Wall Street Journal reports that some of Obama's senior White House staff have been regularly visiting the Chicago campaign headquarters, with senior Obama advisers Pete Rouse and David Plouffe spending about a day a week in Chicago. Per the Wall Street Journal:
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