Hello Adam, Want to welcome you as a guest, and suggest that you check the site at: www.wikitree.com/wiki/How_to_use_Wiikitree Hopefully, this will help you get started. If, you need further assistance just ask to see if someone will help. Hope, between this and my answer to your question you can get things up and running for you.
Found none of the names or dates with them that you thought might apply and none showed up in Pennsylvania. However, I did run a check on all of them on Find A Grave by doing a thorough check in all the states and all the counties and came up with the following the dates that you gave are close to the ones I found click on each one of the names in this and read the inscriptions that they each provide. This is a whole family. You may want to check these out further for other sources, but you may find that John McCardell was either married to Leah first or second. But did not find anything on her. Anyway here is the site you will type in as the link isn't wanting to go through but if you type it in it works because I tryed it.
http://www.findagrave.com/cgi-bin/fg.cgi?page=gsr&GSln=McCardell&GSiman=1&GScid=2423036& Best wishes!
