Now to the Race to the White House. Tonight, Vice President Kamala Harris and her running mate, Governor Tim Wall, stumping in the critical battleground of Pennsylvania today, ahead of the convention. This, as a new ABC news poll, shows a dramatic shift in this race. Harris now leading nationally, erasing Trump's previous advantage with key independent voters. But Trump still edging out Harris on trust to handle top issues like the economy and immigration. Abc's White House Correspondent Mary Alice Parks is on the campaign trail tonight in Pennsylvania. Yeah.

A new candidate and a whole new race. Tonight, hours from the start of the DNC, new polls showing vice President Kamala Harris transforming the 2024 election dynamic, eclipsing President Joe Biden in the race to defeat former President Donald Trump.

The real and true measure of the strength of a leader is based on who you lift up. That's what we see as strength. We know what strength looks like. That's what strength looks like. Anybody who's about beating down other people is a coward.

Harris now with a six-point lead nationwide among likely voters in our new ABC News Washington Post poll. Harris invigorating young voters now up by 20 points. Biden had only been up by two. And independent voters now favoring Harris by 11 points. Biden was down four points against Trump. Republican vice presidential nominee Senator JD Vance not taking those numbers to heart.

Kamala Harris got a bit of a sugar high a couple of weeks ago. But what we've actually seen from our own internal data, Shannon, is that Kamala Harris has already leveled off.

Vice President Harris and her running mate, Governor Tim Walsh, out together with their spouses for the first time, greeting supporters in Must Win, Pennsylvania.

They are debuting these new campaign busses, launching this bus tour out in Western Pennsylvania.

This is a really swingy part of this crucial swing state. So much attention has been paid on Pennsylvania the last few months, the last few days. Of course, this is the state that could decide this whole election.

We're so excited about the Harris Wolfs ticket and the hope and the joy.

But on the top issues in this race, our poll follows the former President, leading Harris by 10 points on immigration and 9 points on the economy and inflation, zeroing in this weekend on Harris's economic policies.

She says she's going to lower the cost of food and housing starting on day one. But day one for Kamala was three and a half years ago.

Republicans urging him to stay on message.

His policies are good for America, and if you have a policy debate for President, he wins. Donald Trump, the provocateur, the showman may not win this election.

Voter Ed Friil telling me he was on the fence about Harris, but she won him over.

Then as I started listening to her and following her, I thought, This woman is going to be good for this country. And Mary Alice Parks joins us live now from Western Pennsylvania. Mary Alice, you're learning more tonight about who we can expect to hear from at the convention this week.

Yeah, Mary, tomorrow night will be President Biden's Night, and no doubt it'll be emotional as he formally turns over this convention that he thought would be his. Now, other big names, we know former President Bill Clinton, as well as former Secretary of State, Hillary Clinton, will both speak, as well as former President Barack Obama, former First Lady Michelle Obama. Now, Mary, I can tell you, I a lot of voters here in Pennsylvania today that told me that they were really interested in hearing from the Obamas in particular, because, of course, the Obamas have such a close relationship with the Bidans. Mary.

All eyes on that convention stage in Chicago this week. Mary Alice, thank you.