Sen. Chuck Grassley (R-IA) used Twitter to criticize President Obama's call for action on health care while the president was in Paris over the weekend.
His message: "Pres Obama you got nerve while u sightseeing in Paris to tell us 'time to deliver' on health care. We still on skedul/even workinWKEND."
Clay Johnson from the Sunlight Foundation says Grassley's messages — he sent another tweet addressed to the president later — are refreshing.
"He may not be the most prolific writer in 140 characters or less, but there's something really authentic about it," Johnson says.
He says 200 members of Congress are tweeting, with Republicans outnumbering Democrats 2-to-1.