For McConnell, hard choices await a leader in waiting

Mitch McConnell is days away from knowing whether he will be leading a GOP-controlled Senate for the next two years, but the Kentucky lawmaker is already getting a taste of what it might be like for Republicans to run both chambers of Congress.

Conservatives are seeking assurance from Mr. McConnell that he remains committed to do everything in his power to end President Obama’s health care law, after he warned this week that even if the GOP takes over the Senate the odds — at least for the next two...