Democratic presidential candidate and U.S. Vice President Kamala Harris [Source: Reuters]

Vice President Kamala Harris took her presidential campaign blitz to the largest U.S. teachers’ union, promising a “fight for the future” as new opinion polls showed her narrowing the gap with Republican rival Donald Trump.

Harris’ swift emergence as the successor to President Joe Biden, 81, as the Democratic presidential candidate in the Nov. 5 election has shaken up a stagnant presidential race, with polls showing her narrowing former President Trump’s advantage.

In an address in Houston to the American Federation of Teachers, Harris, 59, focused on economic policy and workers’ rights, touting plans for affordable healthcare and child care and criticizing Republicans for blocking gun limits in the wake of school shootings.

A series of polls conducted since Biden ended his reelection bid on Sunday, including one by Reuters/Ipsos, show Harris and Trump beginning their head-to-head contest on roughly equal footing, setting the stage for a close-fought campaign over the next three-and-a-half months.

A New York Times/Siena College national poll published Thursday found Harris has narrowed what had been a sizable Trump lead. Trump was ahead of Harris 48% to 46% among registered voters, compared with a lead of 49% to 41% over Biden in early July, following Biden’s disastrous debate performance that led to a wave of Democratic calls for him to step aside as candidate.

While nationwide surveys give important signals of American support for political candidates, a handful of competitive states typically tilt the balance in the U.S. Electoral College, which ultimately decides who wins a presidential election.

Harris also got good news on that front as Emerson College/The Hill published a poll finding that she had begun to close the gap with Trump in five critical battleground states: Arizona, Georgia, Michigan, Pennsylvania and Wisconsin. Trump still narrowly leads Harris in all but Wisconsin, which is tied, according to the poll of registered voters in those states.

Together, the polls suggest that while Trump, 78, retains a narrow advantage, he has not seen the sort of bump in support following last week’s Republican National Convention that candidates hope to get out of the highly scripted, televised and expensive events.

Trump on Wednesday night laid into Harris in his first rally since she replaced Biden atop the ticket, then continued his criticism online on Thursday.