Kamala Harris is now a big problem for Republicans

They feel the Kamala-mentum on the battlefield.

Less than two weeks after the vice president became her party's presumptive nominee, Democrats across the country are feeling a wave of optimism that is translating into real, tangible gains - but a real, tangible problem for Republicans.

On Tuesday night, Harris was in Atlanta, Georgia, where she rallied a Trump-like crowd of 10,000 at Georgia State University. An enthusiastic audience responded when she challenged her opponent to "say it to my face" and attend a debate (or debates) with her in person.

That energy is palpable across the country. Harris' campaign has ...