Domenico Montanaro

Tuesday's statewide elections in Kentucky and Virginia were a big night for Democrats. And the results tell us a few things about national politics, consequential issues and President Trump.

In Kentucky, Democrat Andy Beshear, the son of former Gov. Steve Beshear, claimed victory Tuesday night and narrowly leads incumbent Gov. Matt Bevin by about 5,000 votes. Bevin has not yet conceded the race.

It's happening again.

Democrats are wringing their hands, wondering who else might be out there?

Michelle Obama? Sherrod Brown? Mike Bloomberg? Hillary Clinton? Oprah?

Democrats do this mental gymnastics nearly every election cycle — is there anyone not running for president who is better than who is running and can definitely win in a general election?

The fourth Democratic debate was a long one, about three hours, and ended after 11 p.m. ET.

You might not have made it through the whole thing, but there were some potentially consequential moments.

Here are six takeaways:

1. The scrutiny came for Warren, and her vulnerabilities were exposed some

Sen. Elizabeth Warren of Massachusetts was under fire Tuesday night from several opponents, and when that happens to a candidate, you know they're a front-runner.

A slim majority of Americans now approve of the Democratic House-led impeachment inquiry into President Trump, a new NPR/PBS NewsHour/Marist poll finds.

Americans are split, 49%-46%, on whether they approve of Democrats' impeachment inquiry into President Trump, and independents at this point are not on board, a new NPR/PBS NewsHour/Marist Poll finds.

But the pollsters warn that the new developments could change public opinion quickly, especially with 7 in 10 saying they are paying attention to the news.

Updated at 3:43 p.m. ET

Former Vice President Joe Biden called for President Trump's impeachment unless the White House complies with congressional requests for information about a call the president made to a Ukrainian leader.

"We have a president who believes there is no limit to his power," Biden said. "We have a president who believes he can do anything and get away with it. We have a president who believes he is above the law."

There are renewed calls for Supreme Court Justice Brett Kavanaugh to be impeached, after an essay in the New York Times, excerpting a book by Times reporters, was published this weekend.

Elizabeth Warren is on the rise among Democratic voters, but she and other Democrats are less popular with the overall electorate, raising concerns about a bruising primary that could go on for the better part of the next year, a new NPR/PBS NewsHour/Marist poll finds.

The survey also finds President Trump continuing to struggle, with economic concerns seemingly starting to affect his standing, leaving a cloudy picture about the 2020 presidential election.

Updated at 2:53 p.m. ET

There is widespread support among Americans — Democrats, Republicans and gun owners alike — for a number of initiatives to curb gun violence they would like to see Congress pass, according to a new NPR/PBS NewsHour/Marist Poll.

Laws that would screen for the types of people who could use a gun are broadly popular, but when it comes to bans on certain types of weapons and ammunition, a divide emerges.

Labor Day has long been an unofficial start to election season. So far, two rounds of Democratic debates, and two fundraising deadlines have revealed a lot about where the Democratic primary stands.