Sean Raggett gave the Blues a 19th-minute lead, before Alex Gorrin levelled things from the penalty spot on 69 minutes.
Pompey remain fourth in the table, but have been overtaken by Lincoln, who were 1-0 winners at Swindon.
Pompey remain fourth in the table, but have been overtaken by Lincoln, who were 1-0 winners at Swindon.
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