"Now that we have this replacement agreement, it's not a sure thing it will pass through Congress", Hart says.
In Florida and Georgia, Democrats are aiming to become the states' first African American governors.
The politician, who appeared at rallies for candidates Brian Kemp in Georgia and Marsha Blackburn in Chattanooga, Tennessee, said there was "electricity in the air like I haven't seen since '16". If the Democrats can increase the number they hold, it will offer them more opportunities to frustrate Trump's agenda outside Washington.
The Democrats need a net gain of 24 seats to win a majority, which is no small accomplishment, but the president's low approval ratings have given the party reason to hope.
Trump is also telling reporters that Republican enthusiasm is off the charts and that the "level of fervor" is very high.
Meanwhile, former New York Mayor Michael Bloomberg said he was pumping another $5 million in national advertising into the final two days before the midterm elections.
But in the first mid-term under Trump - an utterly unconventional president - there are many unknowns, above all the bottom-line impact of a president who has driven both supporters and foes to a rare fever pitch of emotion.
"I can't speak to the blue, but I can speak to the red", Trump said earlier of Democrats and Republicans.
Historically, the president's party routinely loses House seats in midterm elections.
A less controversial positive outcome for Canada is that a Democratic majority could help defuse the U.S.'s growing trade conflict with China, which Bank of Canada governor Stephen Poloz has called one of the biggest risks to the Canadian economy.
White women without college degrees prefer Republicans by a 12-point margin, though white women with degrees clearly prefer Democrats, 61 percent to 33 percent.
A second poll, by NBC and The Wall Street Journal, also showed Democrats holding the same seven-point advantage over Republicans.
"I think when women are by themselves in a voting booth on Tuesday, they're going to vote for Republicans".
Obama also condemned Trump's escalating racism going into the midterms.
But one of United States voters' major concerns is healthcare, as Republicans have been trying, so far unsuccessfully, to kill off Mr Obama's Affordable Care Act.
But the president - to the unease of some in the party - has instead used his almost nonstop schedule of campaign rallies to keep the spotlight on what he calls the security threat from migrants seeking to enter the nation through Mexico.
"There's got to be consequences when people don't tell the truth, when words stop meaning anything".
"The only check right now on the behavior of these Republicans is you and your vote", Obama told supporters in Gary, Indiana, during a rally for Democratic Senator Joe Donnelly.
Mr Trump has punched back, accusing Mr Obama of leaving behind a trail of broken promises on trade, the economic recovery and a promise during his presidency that patients could keep their doctors under his health care law.
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