The question at this point is whether Sestak can offer a compelling alternative. He can’t merely rely on leftover angst toward Specter’s part switch, and we haven’t seen him tack significantly to the left in the race.

With Sestak holding his real firepower until the final month of their campaign (the primary is May 18), we will probably look back on this as either one of the worst primary challenges in history or one of the best.

DCCC up with ad in Hawaii special

The latest sign that Democrats are taking no chances in former Rep. Neil Abercrombie’s (D-Hawaii) district comes with a DCCC ad being launched against Honolulu City Councilman Charles Djou.

Djou is the lone Republican in a field that features two Democrats, and that math has Democrats concerned in an open special election where all candidates will be in the same race. The special election is a winner-take-all format so whoever gets a plurality of votes takes the seat.

The DCCC’s ad hits Djou for his record on jobs. The special is May 22.

Other updates:

-Sarah Palin and Rep. Michele BachmannMichele Marie BachmannBachmann won't run for Franken's Senate seat because she did not hear a 'call from God' Billboard from ‘God’ tells Michele Bachmann not to run for Senate Pawlenty opts out of Senate run in Minnesota MORE (R-Minn.) will rally together in front of a reported 10,000 attendees at 3 p.m. in Minneapolis. It will likely be carried by at least one cable news outlet. Undersold: the fact that Palin’s potential 2012 opponent, Minnesota Gov. Tim Pawlenty, will also be in attendance.

-A new poll from St. Norbert College and Wisconsin Public Radio shows former Wisconsin Gov. Tommy Thompson (R) leading Sen. Russ Feingold (D-Wis.) 45-33 in a prospective matchup, even though Feingold leads a generic Republican 40-37. Of the 10 or so polls done on this prospective race so far, the only ones showing the incumbent with a lead have come from Democratic-leaning firms or sponsors. Thompson has not announced he's running for the Senate but he's also not ruled it out.

-Paul Maroun has dropped out of the race to face Rep. Bill Owens (D-N.Y.). The Franklin County legislator’s exit clears the way for a head-to-head GOP primary matchup between 2009 candidate Doug Hoffman and businessman Matt Doheny, which should play to the lesser-known Doheny’s advantage.

-Army veteran Matt Zeller will be the Democratic candidate in the increasingly unlikely event that New York Gov. David Paterson (D) calls a special election to replace former Rep. Eric Massa (D-N.Y.). County chairs reportedly made the decision over the weekend. If there is no special election, a regular primary will be held before the November election.