Sen. Hillary Rodham Clinton, a potential presidential candidate, said today that her re-election campaign for a second Senate term had more than $22 million. The former first lady and Democrat said her campaign had raised almost $5.7 million over the last three months and had raised more than $43 million overall. The campaign has spent more than $21.7 million on her bid for another Senate term.Clinton had $19.7 million cash on hand at the end of March after raising more than $6 million during the first three months of the year. Patti Solis Doyle, executive director of the Friends of Hillary campaign committee, said that over the second quarter of this year, the Clinton committee received 38,377 individual contributions with almost 35,000 of those donors giving $100 or less.