Clinton did not acknowledge Obama's winnings or congratulate him on his victories over the past two nights.

EL PASO, Texas (CNN) – For the second election night in a row, Hillary Clinton failed to acknowledge or congratulate Barack Obama after he won the day in dominating fashion.

On Tuesday in El Paso, hours after Virginia had been called for Obama, she stuck to her “Texas campaign kickoff” message and did not stray from an energetic, Lone Star-themed stump speech. She did mention Obama by name, only to chide his health care plan.

On Saturday night in Richmond, Virginia, Clinton spoke to a crowd of thousands at the state’s annual Jefferson-Jackson dinner, but she ignored Obama’s quartet of blowout primary and caucus wins that day as well (Obama also won the Maine caucuses the next day).

The courtesy of conceding a primary or caucus loss - and then congratulating your opponent - is by no means required. But it has become standard practice during campaign season.

Clinton congratulated Obama and John Edwards after their first and second place finishes in the Iowa caucuses. Obama returned the favor in New Hampshire, saying Clinton “did an outstanding job.” That courtesy continued through the early states.

But as the race has shifted to a delegate chase with dozens of states in play around the country, the notion of congratulating one’s opponent seems, for Clinton, to have fallen by the wayside.

WASHINGTON (CNN) - Hillary Clinton's deputy campaign manager has resigned, her campaign confirmed Tuesday night as the New York senator faced another round of disappointing primary results.

Mike Henry is the second senior staff-level departure from the Clinton team in the past three days. He was hired by Patti Solis Doyle - Clinton's former campaign manager - whose resignation was revealed Sunday.

"As someone who has managed campaigns, I share the unique understanding of the challenges that the campaign will face over the next several weeks," Henry said in a Tuesday e-mail to Clinton staffers.

"Our campaign needs to move quickly to build a new leadership team, support them and their decisions and make the necessary adjustments to achieve the winning outcome for which we have all worked so hard for over a year now."

Howard Wolfson, spokesman for Clinton's campaign, said that Henry had done "an outstanding job for the campaign and his expertise will be missed."

Henry, who helmed the Democratic Senatorial Campaign Committee's independent expenditure program two years ago, was the author of an internal memo last year that suggested Clinton should skip Iowa - a proposal that was quickly dismissed when it became public.

A year earlier, he managed the successful campaign of Virginia's Democratic Gov. Tim Kaine, and was a lead advisor to former Virginia Gov. Mark Warner's campaign.

CNN projects that Clinton's rival for the Democratic presidential nomination, Illinois Sen. Barack Obama, won Tuesday night's Virginia Democratic primary.