Rep. Jacky Rosen leads incumbent Sen. Dean Heller by three points in the race for a Nevada U.S. Senate seat, in a new CNN poll of likely voters. Heller had taken the lead in most polls in recent weeks after the fight over the Supreme Court nomination of Brett Kavanaugh. Heller is among the most endangered GOP incumbents and the only one running in a state won by Hillary Clinton. Rosen had been hitting Heller for his votes in favor of repealing Obamacare and protections for preexisting conditions.