At this point -- two months before an election, and staged in a hotly contested congressional district -- Senator Allard's immigration hearing is nothing more than an obvious attempt to use taxpayer money to help his party.  This is particularly ironic since the Senate Budget Committee is charged with being a watchdog for taxpayers.
The time for informative field hearings was last year, before the House and Senate passed bills.  At this late stage, field hearings look more like a cheap political stunt than an honest attempt at crafting legislation.  There is too much talking and not enough action on immigration reform.  Both the House and Senate have passed legislation and now it's time to get to work on a compromise bill.