Conor Shaughnessy scored a last-gasp header as the League One leaders stretched their unbeaten run to an impressive 24 games.
Head coach Mousinho said: “I’m delighted we’ve won of course. The manner of it, scoring in added time at the Fratton End, was just brilliant.
“I feel we’ve nicked one today, and Carlisle can feel very hard done by because they played very well. But I thought we were excellent in the first half.
“We controlled the game, but we just couldn’t put the ball in the net.
“The second half was disappointing all in. I think we let ourselves down tactically to be honest. I thought we went a bit straight too much to the centre forward. I like to see us get the ball around the outside wide down the wings because we cross the ball well.
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