Washington ? Stop blocking legislation to limit the amount of money corporations and unions can spend on campaign advertising, President Barack Obama is telling Republicans, saying their strategy is “politics at its worst.”

“This is common sense,” Obama said in his weekly radio and Internet address Saturday. “In fact, this is the kind of proposal that Democrats and Republicans have agreed on for decades. Yet, the Republican leaders in Congress have so far said ‘no.”‘

At issue is a Supreme Court ruling that reversed a century-long trend of limiting the power of big money in politics by saying corporations and unions may spend heavily to influence presidential and congressional elections.

Republicans, seen as mostly benefiting from the ruling, argue that Democrats are only trying to protect themselves with the bill.