A couple of weeks old, but I missed it. USA Today reports that
Only 7.3% of 2006 tax returns filed from Jan. 1 to April 14 designated a $3 contribution to the public campaign-financing system, according to data the Internal Revenue Service prepared for USA TODAY. It is the latest sign that taxpayer support to help pay for presidential campaigns is waning….. In 2004, 9.2% of returns bore the checkoff, according to the FEC. The high was 28.7% in 1980.