In what has become an obligatory bit of choreography on the eve of a primary, the Clinton campaign on Monday released a new attack ad going after Barack Obama’s opposition to a gas-tax holiday. The Obama campaign fired right back with a she’ll-say-anything spot that doesn’t mention the gas tax but quotes the New York Times as the phrases “the low road” and “does nothing but harm” unfurl onscreen beside Hillary’s face. Both commercials aired in Indiana and North Carolina.

By CNN’s count, Obama has a 1745 – 1602 lead in delegates entering tonight’s primaries. By MinMon’s count, there are 111 shopping days left before the Denver convention.

Hillary Clinton: “What’s Happened?” (:30)

Barack Obama: “Hometown” (:30)