The Washington Post says the candidates are using the topic of energy policy to “to tack back to core themes of their campaigns.”

Sen. Barack Obama’s (D-IL) campaign on Tuesday provided ABC’s Jake Tapper with more detail on the Democratic candidate’s plan to impose a windfall profits tax on oil companies. A “well-designed mechanism can impose a fee on a small share of these windfall profits without affecting incentives for oil companies and without affecting the price of oil,” the campaign said.

A Wall Street Journal political blog describes Sen. John McCain’s tour on Tuesday of a Michigan nuclear plant.