Mara Liasson

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Hillary Clinton will break the penultimate glass ceiling this week — becoming the first female nominee of a major American political party.

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Conventions give candidates a second chance to make a first impression, even candidates who have been covered by the media as obsessively as Donald Trump.

The Republican convention in Cleveland gives Trump that chance. Here are six things to watch this week:

1. Will the Cleveland convention stick to a script?

Donald Trump's wife, Melania Trump, may be quiet but she's not invisible.

She spends most of her time at home, raising the couple's 10-year-old son, Barron, and sometimes makes appearances with her husband at rallies. On occasion, she introduces him.

Now, she is scheduled to address the Republican National Convention Monday night.

At a Milwaukee rally in April, she sounded a bit like her husband, the presumptive GOP nominee.

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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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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?

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

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.

Five delegate-rich states on the East Coast will vote Tuesday: Maryland, Pennsylvania, Delaware, Rhode Island and Connecticut. Call it the "Acela Primary" for the train that runs through those states.

There's a lot at stake. Here are four things we're watching:

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Donald Trump is the GOP delegate leader and has the clearest path to the presidential nomination of any remaining candidate. But does he have an electoral path to 270 in November?

There's a basic math problem for any Republican nominee.

In every one of the past six presidential elections, Democrats have won states that add up to about 240 electoral votes — pretty close to the majority needed to win.

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