[cnn-photo-caption image= http://i.l.cnn.net/cnn/2008/POLITICS/02/10/feb.9.contests/art.obama.clinton.gi.jpg caption="Sens. Clinton and Obama remain in a tight race for the Democratic nomination after Saturday's voting."]
WASHINGTON (CNN) - Sen. Barack Obama swept Saturday's Democratic contests, giving him considerable momentum heading into Sunday's Maine caucuses and three primaries Tuesday.
John McCain, however, was handed a starkly different message from the GOP, as voters in Louisiana and Kansas indicated they weren't ready to support the Arizona senator. Washington, however, backed the Republican front-runner over former Arkansas Gov. Mike Huckabee, according to state party officials.
McCain's camp congratulated Huckabee on the victories but with an air of confidence, saying that Huckabee threatened only to chip away at McCain's substantial lead in the GOP race for the presidential nomination.
"The reality is that John McCain is the presumptive nominee of our party," said campaign spokesman Brian Rogers. "We'll campaign in these upcoming states as long as Gov. Huckabee is in the race, but our main focus is on uniting the Republican Party for victory in November."
Though CNN calculations estimate that Huckabee would need to snare hundreds more delegates to catch McCain, the Democrats are in a much tighter race.