Monbiot...
... Since 1990, the energy and natural resources sector (mostly coal, oil, gas and electricity) has given $418m to federal politicians in the US(13). Transport companies have given $355m(14). ... The big polluters favour the Republicans, but most of them also fund Democrats. During the 2000 presidential campaign, oil and gas companies lavished money on George Bush, but they also gave Al Gore $142,000(15), while transport companies gave him $347,000(16). The whole US political system is in hock to people who put their profits ahead of the biosphere.
http://www.monbiot.com/archives/2007/12/17/hurray-were-going-backwards/