A glut of e-mail from constituents and special interest groups continued to pose problems for the Web sites for members of the U.S. House of Representatives on Thursday, as millions of Americans attempt to voice their opinions on the financial bailout package the day before an expected vote on the measure. Jeff Ventura, a spokesperson for the House’s chief administrative officer, called the volume of e-mail flowing through member Web sites “staggering and unprecedented.” He said more than two-dozen interest groups sending large batches of e-mail have contributed to the problem. “Advocacy groups are collecting e-mails and then shoving them into a system that was really designed for manual input, not for people to send us wholesale batches of thousands of e-mails at a time,” Ventura said. Still, he said, e-mails from individual users still far outnumber those submitted in bulk. The timing of the Wall Street rescue package also