Here's the backstory on Lopez: he began working for Doolittle in 1985, when Doolittle was a California state senator. When Doolittle won his Congressional seat in 1991, Lopez came with him as his chief of staff. Lopez announced his resignation in February 2005; but even after Lopez left the Hill, Doolittle didn't stop writing him checks.
Since May 2005, Doolittle's campaign has paid David Lopez about $4600 a month for "fundraising consulting." His wife Kathy had worked with the campaign before he stepped down; in total, the campaign has paid her nearly $9,000 in fees and $17,445 in reimbursements since January 2005.
We can't figure out exactly what he does, however, and I understand others have similar trouble. Lopez won't call us back, and neither will the Doolittle campaign.
Lopez brings a bit of a cloud with him, of course. Earlier this year, AP revealed he had taken a "fact-finding" trip to Puerto Rico in 2001, courtesy of Jack Abramoff's firm. One of his former colleagues on Doolittle's staff, Kevin Ring, went to work for the now-disgraced lobbyist in 1998. He remained in frequent contact with Doolittle's office, according to the lawmaker.
The Department of Justice also had an interest in Lopez at one point: it examined his financial disclosure filings with the House of Representatives for the years 1999 through 2004, according to Roll Call.