As election models increasingly show a favorable Senate result for Republicans and a toss-up race for the White House, there is a significant chance that the House Democratic leader, Congressman Hakeem Jeffries, may be the most powerful Democrat in the country come January should his party be able to flip just a handful of seats to retake the House majority. Should President Trump prevail in the electoral college and Senate Republicans take down at least one incumbent Democrat, Mr. Jeffries will be the only man standing against the Trump White House.