WASHINGTON (CNN) -- Sen. Hillary Clinton added a previously unscheduled campaign stop Wednesday in West Virginia, soldiering on after a split decision in Tuesday's voting in Indiana and North Carolina, her aides said.
The senator plans to appear at 11:45 a.m. at Shepherd University in Shepherdstown, West Virginia, Clinton aides told reporters about 3 a.m. Wednesday.
Her daughter, Chelsea Clinton, had already been scheduled to speak at the university.
The schedule announcement came hours after Clinton pledged to keep fighting for the nomination despite long odds.
She eked out a victory in the Indiana primary, receiving 51 percent of the vote compared with 49 percent for Obama. In North Carolina, however, Obama won a decisive victory, capturing 56 percent of the vote to Clinton's 42 percent.
Democratic primary voters go to the polls next Tuesday in West Virginia, a state with a population that is older, whiter and more rural than the country as a whole. Those demographics have worked to Clinton's favor in other states, and several recent polls have showed her with a strong lead over Obama there.
Even so, Obama widened his lead in pledged delegates as a result of Tuesday's voting, according to CNN estimates, making it that much more difficult for Clinton to win the nomination.
Obama's campaign said "the tight finish in Indiana and Barack Obama's huge win in North Carolina have fundamentally changed this race.
"She missed her last chance to catch up in the delegate count -- the measure that will determine the Democratic nominee."
Clinton aides repeated their argument that Clinton stands a better chance at beating the presumptive Republican nominee, Sen. John McCain, in the general election.
After West Virginia, Democratic primary voters are scheduled to go to the polls in Kentucky and Oregon on May 20, in Puerto Rico on June 1 and in Montana and South Dakota on June 3.
-- CNN's Alexander Marquardt and Jim Acosta contributed to this report