WASHINGTON (CNN) -- After disappointing first quarter fundraising numbers, Sen. John McCain, R-Arizona, is boosting his efforts with a money-raising binge all over the country.

Since formally announcing his intentions to run for president, the candidate has planned at least 12 top dollar fundraisers for the month of May, where attendees were asked to contribute the maximum for the primary, $2,300, according to his campaign calendar posted on his website. And at fundraisers in New York and New Jersey, the ticket for admission was a pledge to raise $9,200 for the campaign.

McCain's campaign schedule shows that he will visit at least a dozen states in May and on some days hold up to four fundraisers. The Republican candidate is focusing most of his time in states with primaries that fall on or before Feb. 5, 2008.

Advisors told the Washington Post last month that the first priority of the campaign was to raise $20 million by the close of the second quarter at the end of June. A campaign spokesman would not confirm or deny the Post report or speak directly about the senator's fundraising.

McCain came under scrutiny for his poor fundraising numbers in the first three months of 2007 compared to his chief rivals, former Massachusetts Gov. Mitt Romney and former New York City Mayor Rudy Giuliani. McCain has since replaced his finance director.