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A new gun control law cleared a major Senate hurdle Thursday, with 16 Republicans voting with most of the chamber’s Democrats to begin the process of moving one of President Barack Obama’s top domestic initiatives through a long, legislative slog.

Senators voted 68 to 31, with a handful of Republicans joining most Democrats, on a procedural measure to begin consideration of a proposed gun law that would expand background checks for gun sales, and strengthen mental health and school safety programs.

The vote is just the opening step, though, of a debate that could stretch out for weeks and encounter any number of obstacles – namely, the Republican-controlled House of Representatives – before reaching Obama’s desk.

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