which president had a son names Bennie that died young, didn't swear on the bible at inauguration, is ranked among the least effective presidents ever and ran over a woman with his horse?

The answer and a brief biography are here:

http://www.doctorzebra.com/Prez/g14.htm

This probably the president you want.

http://en.wikipedia.org/wiki/Franklin_Pierce#Presidency_1853-1857

Note that he "affirmed" but did not "swear" his oath on a Bible.

I was not aware of the refusal to take the Oath of Office on a Bible.

The president you are referring to is Franklin Pierce, who served as the 14th President of the United States from 1853 to 1857.

To find this information, you can follow these steps:

1. Start by searching for "U.S. presidents list" or "list of U.S. presidents" on a search engine. This will provide you with a list of all the presidents.

2. Reviewing the list, you will find Franklin Pierce as the 14th President.

3. Once you have identified Franklin Pierce as the president in question, you can search for more specific information about him. To begin, you can search for "Franklin Pierce son Bennie death" or "Franklin Pierce inauguration oath" to find details about his son's death and his inauguration.

4. By searching for "Franklin Pierce least effective president" or "ranking of U.S. presidents," you can find various rankings that place him among the least effective presidents. Keep in mind that rankings can vary based on different criteria and perspectives.

5. To find information about the incident involving a horse, you can search for "Franklin Pierce horse incident" or "Franklin Pierce running over a woman with horse." This should provide you with relevant details about the incident.

Remember to verify the information from multiple reputable sources to ensure accuracy and a comprehensive understanding of the topic.