By Joseph Ax (Reuters) – In the days after a draft leaked showing the U.S. Supreme Court is poised to strike down Roe v. Wade and a national right to abortion, the left-wing group MoveOn doubled its weekly fundraising. A Michigan effort to place abortion rights on the ballot gained more than 13,000 new volunteer sign-ups. And on Saturday, hundreds of thousands of protesters are expected to attend more than 300 rallies in a coordinated nationwide demonstration. The news that the court’s conservative majority appears set to reverse its 1973 decision that legalized abortion nationwide has galvani…