WASHINGTON — The 37th time won't be the charm. But House Republicans are charging forward anyway this week on a vote to repeal President Obama's signature health care overhaul, which will put the number of times they have tried to eliminate, defund or curtail the law past the three-dozen mark. "This is what, the 40th time they're going to do it?" scoffed Representative Nancy Pelosi of California, the Democratic leader, confessing that she had lost count. "Thirty-eight? 39? 40? 41?" She eventually settled on "high 30s" as her best guess.