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President Obama's own party dealt him a stinging rebuke when it rejected a key part of the fast-track trade promotion authority the White House wanted. Not even 11th-hour visits to both the Congressional Baseball Game Thursday night and to Capitol Hill Friday morning could cobble together enough support from his own party to advance the legislation. House Republicans say they will try again next week thanks to a procedural maneuver and the White House has dismissed it as a "snafu," but still it's something this president has spent a lot of political capital on.

It's a win for progressive groups and labor, who aggressively pressured many members to oppose the trade bill. Liberal groups, like Democracy for America, founded by the brother of former Vermont Gov. Howard Dean, threatened to primary Democrats who voted for the bill. And labor groups began running ads against some members. If there is a litmus test for the left that will be remembered this election, this vote is it.

It's a turn of the tables from what's been seen in recent years with Republicans battling with conservative groups, who threaten repercussions at the ballot box for out-of-step votes. It's already spilled over into the presidential race, as well. Hillary Clinton has so far stayed mum on how she would have voted, while her increasingly insurgent challenger, Vermont Sen. Bernie Sanders, was a top opponent. It's something Sanders has gained traction on, saying he doesn't understand how she doesn't have an opinion on this. Now, with her campaign "officially" kicking off Saturday, the drumbeat for her to tip her hand will grow even louder.

Presidential candidates with something to prove — it's never too late for a first impression? Speaking of Clinton's kickoff, expect to see a another side of Clinton. Her speech Saturday will try to reintroduce her and show a softer side while she tries to home in on a middle-class economic message. Remember the Saturday Night Live characterizations of her as an awkward and determined politician? That's the narrative her campaigns wants to shed — especially with voters increasingly saying they don't trust her and don't think she understands them. Her speech will largely tell the story about her late mother Dorothy's struggles and how that informs her push for the middle class.

Former Florida Gov. Jeb Bush, too, will be trying to recast himself as he launches his presidential bid on Monday. The good news for the Republican is that his trip overseas didn't generate the kind of negative headlines, like in the way that happened to some of his likely rivals, that could have overshadowed his announcement. But he's had a bumpy lead up to this point — flubbing the Iraq question, a campaign staff shakeup and a controversy over his 1995 book in which he called for the "restoration of shame" for unwed mothers. Bush said while abroad that his views have "evolved" but that "his views about the importance of dads being involved in the lives of children hasn't changed at all." That explanation isn't going to put it to rest, especially if he and Hillary Clinton makes it through their respective primaries.

The Donald problem. Republicans could quickly have a Donald Trump problem if the boisterous businessman does, indeed, get in the presidential race on Tuesday, as he keeps teasing. If anyone was going to stage a big event and not make a presidential announcement this week, it's Trump. Remember, in 2011 he wooed media to New Hampshire, claiming triumph for getting President Obama to release his long-form birth certificate and then later passed on a bid.

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