Tim Kaine Seems Hillary Clinton’s No. 2, but Liberals Balk

Democrats close to Hillary Clinton’s presidential campaign signaled strongly Thursday that she would choose Senator Tim Kaine of Virginia as her running mate, rounding out the ticket with a popular politician from a battleground state.

Both former President Bill Clinton and the White House have expressed their support for Mr. Kaine, but aides cautioned that Mrs. Clinton had not yet made a final decision and that other candidates were still under consideration.

Mrs. Clinton is widely expected to announce her choice in an email to supporters while on a campaign swing in Florida on Friday afternoon, an attempt to regain momentum the day after her Republican opponent, Donald J. Trump, accepted his party’s nomination in Cleveland. With Mr. Kaine emerging as a clear favorite, one group already expressed disappointment at the prospect of the former governor of Virginia joining the ticket: liberals.

Many of the groups that backed Senator Bernie Sanders of Vermont in his Democratic contest against Mrs. Clinton had hoped she would extend an olive branch to the liberal wing of the party and choose a vice-presidential candidate whose stances on Wall Street and global trade deals closely aligned with those of Mr. Sanders.

But with the Democratic National Convention beginning in Philadelphia on Monday, the prospects have dimmed for the two liberal senators who were being considered, Elizabeth Warren of Massachusetts and Sherrod Brown of Ohio. That has led to more liberal scrutiny of Mr. Kaine’s record.

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