Valentine has brought in more than $300,000 so far.
Among his contributors was one who listed his occupation on campaign finance forms as retired former president. George W. Bush gave $500. Valentine once worked for Bush as a manager in the Texas Rangers organization.
Valentine is running as an independent.
Democratic state Representative Caroline Simmons brought in a total of $240,000 during her campaign.
Incumbent Democratic Stamford Mayor David Martin is in third place for fundraising, with almost $80,000 collected in total.
Martin tells the Stamford Advocate he has been out-raised in previous elections... and won anyway.