Mara Liasson

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Donald Trump is headed for steel country today. He's going to be talking about trade, and that is nothing new. Back in the primaries, Trump made a bold promise to supporters in Pittsburgh.

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Donald Trump did what Republicans have begged their presidential candidate to do for months — lay out the case, from A to Z, against Hillary Clinton.

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About an hour and a half after President Obama met Bernie Sanders at the White House, Obama endorsed Hillary Clinton for president. Today's announcement was ready to go in a pre-produced video.

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Hillary Clinton is now the presumptive nominee of her party.

In a tight race against Donald Trump, with high unfavorable ratings of her own, she needs all the help she can get. And in a few days she will officially have the support of the most valuable player on the Democratic Party team — President Obama.

He can help her in several crucial ways.

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Hillary Clinton delivered a remarkable speech Thursday, one that was billed as a foreign-policy address, but was principally about laying out the case for why Republican Donald Trump is disqualified to be commander in chief.

Here are three questions answered:

1. What did she do with this speech?

The 1990s are back.

For months Donald Trump has been saying that he planned to attack Hillary Clinton for the sex scandals that embroiled her husband's presidency in the '90s. He has said she "enabled" her husband's infidelities and "hurt" the women who were his accusers, although he hasn't offered any evidence of how she did that.

The first big T.V. advertising battle of the 2016 election is just beginning. Priorities USA, the big pro-Hillary Clinton superPAC began spending what it says will be $136 million on political ads.

Those ads may go a long way toward answering one of the biggest questions of this cycle: Is Donald Trump immune to negative advertising?

Both Hillary Clinton and Donald Trump are turning their attention to the general election and to one of the most important decisions they will make — choosing a vice president.

Picking a vice president is the first "presidential level" decision any candidate makes. Although vice presidential candidates have rarely, perhaps never, determined the outcome of an election, the choice tells voters a lot about the candidate.

The two most important criteria are always the same:

1. Pick someone who would ready to be president, if necessary, and
2. DO NO HARM

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Hillary Clinton isn't over the finish line yet, but as she continues to battle Bernie Sanders she's also turning her attention to a general election matchup with Donald Trump.

A lot of Democrats say that in order to beat Trump, she needs to be developing a clearer message on the economy.

That's not Donald Trump's problem.

Not only does he have a simple, clear message — he often says so himself.

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