WASHINGTON (AP) — An economic aid plan to send rebates of $600-$1,200 to most taxpayers passed a key test Monday in the Senate, where Democrats are pushing to add more than $40 billion in help for seniors, disabled veterans and the unemployed.

Democrats were ratcheting up pressure on Republicans to support the add-ons, part of a proposal to pump $204 billion into the economy over the next two years. The House passed its $161 billion economic stimulus package last week with overwhelming backing from both parties.

The Senate voted 80-4 Monday evening to advance that package, setting the stage for a test-vote as early as Wednesday on Democrats' much larger proposal.