Pro-immigration House Democrats on Thursday marked what they called a "milestone" of 100 co-sponsors for a comprehensive reform bill that includes a path to citizenship for illegal immigrants. Flanked by a group of immigrants, Democratic lawmakers said at a news conference that achieving 100 co-sponsors shows that immigration reform has the momentum necessary to become law. Still, the bill faces an uphill battle in Congress. House members are wary of facing voters in November who are split on what to do about immigration. The stringent but popular anti-immigrant law in Arizona is adding considerable fuel to the fire.