H.R.1523: To provide for interregional primary elections and caucuses for the selection of delegates to political party Presidential nominating conventions.

Interregional Presidential Primary and Caucus Act of 2007 - Divides the United States into six regions of specified states to provide for: (1) interregional primary elections and caucuses, according to a certain order; and (2) selection of delegates to political party presidential and vice presidential national nominating conventions.