If you know how to use javascript and jquery you can easily make a news ticker using jQuery News Ticker (that is what I think you are asking for).
It can consume the RSS feed exposed by the mojoPortal blog feature and a few other mojoPortal features also provide rss feeds that could be consumed using jQuery News Ticker.
But you would need to understand html and css and jquery/javascript and embed it where you want in the layout.master file of your mojoPortal skin. If you know those things then their instructions should get you going.
mojoPortal already includes the main jquery files so you would only need to add the script for the widget.
Hope that helps,
Joe